states. at the u.s. consulate in benghazi, libya's second largest city, at least one american staff member was killed after gunmen stormed the compound and burned it down. we've got some amateur video here into nbc news from the scene. if you listen, you can hear gunshots going off in the background. witnesses say the attackers were armed with automatic rifles, rpgs. libyan forces stationed there said to have little to stop the violence. >>> in neighboring cairo, angry protesters scaled the fortified walls of the u.s. embassy, destroyed the american flag and replaced it with a black islamic banner. most of the u.s. diplomatic staff had already been evacuated in anticipation of this protest. both incidents reportedly are reaction to a little-known amateur movie produced in the united states which ridiculed the prophet mohammed. it gained attention because an obscure florida pastor began promoting it, the same man who triggered deadly riots in afghanistan when he threatened to burn the koran. we want to go straight to cairo where we find nbc chief foreign correspondent, richard engel.